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Photoreceptor for electrophotography

a photoreceptor and electrophotography technology, applied in the field of photoreceptors for electrophotography, can solve the problems of difficult production conditions, poor durability, and prone to selenium crystallization with heat or mechanical impact, and achieve the effects of not impairing the basic performance of electrophotography, good stability to repeated use, and small change in charge potential and residual potential

Inactive Publication Date: 2010-04-29
HODOGOYA CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a photoreceptor for electrophotography that has improved durability and performance. The technical effect of the invention is to provide a photoreceptor that has a low residual potential in an initial stage, is inhibited from increasing residual potential, is prevented from decreasing charge potential, and undergoes little fatigue deterioration even upon repeated use. The invention achieves this by using a charge-transporting agent with an arylamino group in the molecule, which has excellent properties such as sensitivity, durability, and inhibition of deterioration with repeated use.

Problems solved by technology

For example, selenium has drawbacks that it necessities difficult production conditions and that selenium is apt to crystallize with heat or mechanical impact.
Zinc oxide and cadmium sulfide have problems concerning moisture resistance and mechanical strength and further have a drawback that these substances deteriorate in suitability for charge or exposure by the action of a dye added as a sensitizer, resulting in poor durability.
Silicon also necessitates difficult production conditions and further necessitates use of a highly irritant gas, resulting in a high cost.
In addition, selenium and cadmium sulfide have a problem concerning toxicity.
However, a satisfactory photoreceptor has not been obtained so far.
Although organic materials have many merits not possessed by inorganic materials, no organic photoreceptor which satisfies all the properties required of photoreceptors for electrophotography has been obtained so far.
Namely, organic photoreceptors suffer a decrease in charge potential, increase in residual potential, change in sensitivity, etc. due to repeated use and this results in deterioration in image quality.
However, photoreceptors having satisfactory initial sensitivity are not sufficiently inhibited from deteriorating with repeated use, while ones reduced in deterioration with repeated use have problems concerning initial sensitivity and electrification characteristics.
Furthermore, even the technique in which a calixarene compound is added (see, for example, patent document 3) has not produced a sufficient effect.
As described above, the effect of inhibiting the deterioration has not been sufficiently obtained so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0091]In 13 parts of methanol was dissolved 1 part of an alcohol-soluble polyamide (Amilan CM-4000, manufactured by Toray Industries, Inc.). Thereto was added 5 parts of titanium oxide (Tipaque CR-EL, manufactured by Ishihara Sangyo Kaisha, Ltd.). The resultant mixture was treated with a paint shaker for 8 hours to disperse the titanium oxide and thereby produce a coating fluid for undercoat layer formation. Thereafter, the coating fluid was applied with a wire-wound bar to the aluminum side of a PET film having a vapor-deposited aluminum coating, and then dried to form an undercoat layer having a thickness of 1 μm.

[0092]Subsequently, 1.5 parts of titanylphthalocyanine oxide having a Cu-Kα X-ray diffraction spectrum having an intense peak at diffraction angles 2θ±0.2° of 7.5, 10.3, 12.6, 22.5, 24.3, 25.4, and 28.6 (charge-generating agent No. 1)

was added to 50 parts of a 3% cyclohexanone solution of a poly(vinyl butyral) resin (S-LEC BL-S, manufactured by Sekisui Chemical Co., Ltd.)...

example 2

[0097]A photoreceptor was produced in the same manner as in Example 1, except that titanylphthalocyanine oxide giving a Cu-Kα X-ray diffraction spectrum having an intense peak at diffraction angles 2θ±0.2° of 9.6, 24.1, and 27.2 (charge-generating agent No. 2) was used in place of the charge-generating agent No. 1 and that the following p-terphenyl compound (charge-transporting agent No. 2)

was used as a charge-transporting agent in place of the benzidine compound (charge-transporting agent No. 1).

example 3

[0100]Ten parts of an alcohol-soluble polyamide (Amilan CM-8000, manufactured by Toray Industries, Inc.) was dissolved in 190 parts of methanol. The resultant solution was applied with a wire-wound bar to the aluminum side of a PET film having a vapor-deposited aluminum coating, and then dried to form an undercoat layer having a thickness of 1 μm.

[0101]Subsequently, 1.5 parts of the following r-form metal-free phthalocyanine as a charge-generating agent (charge-generating agent No. 3)

was added to 50 parts of a 3% cyclohexanone solution of a poly(vinyl butyral) resin (S-LEC BL-S, manufactured by Sekisui Chemical Co., Ltd.). The resultant mixture was treated with an ultrasonic disperser for 1 hour to disperse the charge-generating agent. The dispersion obtained was applied to the undercoat layer with a wire-wound bar and then dried at 110° C. and ordinary pressure for 1 hour to form a charge-generating layer having a thickness of 0.6 μm.

[0102]On the other hand, 0.1 part of cyclic phen...

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PUM

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Abstract

An object of the invention is to provide a photoreceptor for electrophotography which has a low residual potential in an initial stage, is inhibited from increasing in residual potential, is prevented from decreasing in charge potential, and undergoes little fatigue deterioration even upon repeated use. The invention relates to a photoreceptor for electrophotography which has a photosensitive layer containing a cyclic phenol sulfide represented by the following general formula (1):and one or more charge-transporting agents each having an arylamino group in the molecule, and which has excellent durability.

Description

TECHNICAL FIELD[0001]The present invention relates to a photoreceptor for electrophotography. More particularly, the invention relates to a photoreceptor for electrophotography which changes little in charge potential and residual potential even upon repeated use and has excellent durability.BACKGROUND ART[0002]Inorganic photoconductive substances such as selenium, zinc oxide, cadmium sulfide, and silicon have hitherto been used extensively in photoreceptors for electrophotography. Although these inorganic substances have many merits, they had various drawbacks. For example, selenium has drawbacks that it necessities difficult production conditions and that selenium is apt to crystallize with heat or mechanical impact. Zinc oxide and cadmium sulfide have problems concerning moisture resistance and mechanical strength and further have a drawback that these substances deteriorate in suitability for charge or exposure by the action of a dye added as a sensitizer, resulting in poor dura...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03G5/04G03G5/047
CPCG03G5/0521G03G5/0607G03G5/062G03G5/0616G03G5/0614G03G5/061446G03G5/061443G03G5/06147G03G5/05G03G5/06
Inventor KOIKE, MAKOTOABE, KATSUMITAKESUE, ATSUSHI
Owner HODOGOYA CHEMICAL CO LTD
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